40781895 has 128 divisors (see below), whose sum is σ = 90243072. Its totient is φ = 15206400.

The previous prime is 40781893. The next prime is 40781911. The reversal of 40781895 is 59818704.

40781895 = 1351² + 1352² + ... + 1372².

It is not a de Polignac number, because 40781895 - 2¹ = 40781893 is a prime.

It is a super-4 number, since 4×40781895⁴ (a number of 32 digits) contains 4444 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40781893) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 608652 + ... + 608718.

It is an arithmetic number, because the mean of its divisors is an integer number (705024).

Almost surely, 2^40781895 is an apocalyptic number.

40781895 is an abundant number, since it is smaller than the sum of its proper divisors (49461177).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40781895 is a wasteful number, since it uses less digits than its factorization.

40781895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141.

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 40781895 is about 6386.0703879616. The cubic root of 40781895 is about 344.2091948012.

The spelling of 40781895 in words is "forty million, seven hundred eighty-one thousand, eight hundred ninety-five".